Exciting news for fans of GPU rendering: the Indigo 4 public beta is out! After a long development period a first beta of Indigo 4 is ready to make some amazing images at blazing speeds, using all your OpenCL devices - NVIDIA, AMD and Intel GPUs are all welcome to the rendering party.

In addition to the new pure GPU rendering, there are some other new features:* General optimisations and rendering speedups:* Most scenes should render faster on the CPU.* MLT should be a lot faster for simple scenes now.* OpenGL viewport is a lot faster* Sped up rendering double-sided thin material a lot.* Optimised object tree building* Rewrote much of Indigo's subdivision and displacement* New image saving options. (check out the 'Image Saving' tab in the options dialog)* Added pixel info picker to toolbar* Added a detachable material preview widget* Oren-Nayar: Added new implementation of the more accurate model, replacing the 'qualitative' model that was being used before.* Added measured BRDF support* Added Fast-SSS material